Detailed sailboat specifications and datasheets since 2015
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Swan 47 Fin keel

Sailboat specifications

The Swan 47 is a 47’10” (14.57m) cruiser-racer sailboat designed by Sparkman & Stephens (United States). She was built between 1974 and 1979 by Nautor's Swan (Finland). The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

The Swan 47 has also been marketed as NYYC 48 and she is as well listed, on Boat-Specs.com, in Keel and centerboard version (see all the versions compared).

Swan 47's main features

Model
Swan 47
Version
Fin keel
Hull type
Monohull
Category
Offshore cruiser-racer sailboat
Sailboat builder
Sailboat designer
Country
Finland
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich fiberglass polyester
Number of hulls built
About 70
First built hull
1974
Last built hull
1979
Appendages
Keel : fin without bulb
Helm
Single helm wheel
Rudder
Single rudder on skeg
Unsinkable
No
Trailerable
No
Standard public price ex. VAT (indicative only)
N/A

Swan 47's main dimensions

Hull length
47’ 10”14.57 m
Waterline length
36’ 4”11.05 m
Beam (width)
13’ 8”4.19 m
Draft
7’ 7”2.33 m
Mast height from DWL
66’ 10”20.35 m
Light displacement (MLC)
32408 lb14700 kg
Ballast weight
15432 lb7000 kg
Ballast type
Lead

Swan 47's rig and sails

Upwind sail area
1366 ft²126.9 m²
Downwind sail area
2652 ft²246.4 m²
Mainsail area
446 ft²41.4 m²
Genoa area
920 ft²85.5 m²
Symmetric spinnaker area
2207 ft²205 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
62’18.9 m
J
 iFore triangle base (from mast foot to bottom of forestay)
19’ 10”6.04 m
P
 iMainsail hoist measurement (from tack to head)
55’ 8”16.98 m
E
 iMainsail foot measurement (from tack to clew)
16’4.88 m
Rigging type
Sloop Marconi masthead
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
0 °
Spars construction
Aluminum spars
Standing rigging
Single-strand (ROD) discontinuous

Swan 47's performances

IOR rating
 iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
34.5
Upwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.

Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat.
228 ft²/T21.15 m²/T
Downwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.
442 ft²/T41.06 m²/T
Displacement-length ratio (DLR)
 iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length:

a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
309
Ballast ratio
 iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.

The higher the ballast ratio is, the greater is the stability.
48 %
Wetted area
506 ft²47 m²
Critical hull speed
 iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
8.07 knots

Swan 47's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
61 HP
Fuel type
Diesel
Fuel tank capacity
52.8 gal200 liters

Swan 47's accommodations and layout

Cockpit
Twin cockpit (center and closed aft)
Cabin(s)
2
Berth(s) (min./max.)
7 / 9
Head(s)
2
Freshwater tank capacity
92.5 gal350 liters
Fridge/ice-box capacity
66 gal250 liters
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